BACKGROUND:Abnormal stress is an important factor causing intervertebral disc degeneration. To establish an ideal in vivoanimal model of intervertebral disc degeneration is of great significance for in-depth study on the related pathogenesis. OBJECTIVE:To develop anin vivo rabbit intervertebral disc model and to investigate the relationship between continuous tensile load and intervertebral disc degeneration. METHODS:Twenty-five New Zealand white rabbits aged 6 months old were randomly divided into three groups: blank control (n=5), sham (n=10) and experimental (n=10) groups. The blank control group received no intervention, and the L4/5 segments were removed at the 1st day. The intervertebral disc assistor was used to fix the L4 and L5 vertebral bodies in the experimental and sham groups, the L4/5 segments in the experimental group were loaded 1 MPa axial tensile force, and the L4/5 segments in both two groups were then removed at 14 and 28 days. The changes of L4/5 intervetebral space height and surrounding bone substance were observed by X-ray examination, the morphological changes of the intervertebral disc were observed by hematoxylin-eosin staining, the cell survival was detected by nitro blue tetrazolium staining and mRNA expression levels of aggrecan, collagen type Ⅱ and SOX9 in the intervertebral disc tissues were assessed by RT-PCR at each time point. RESULTS AND CONCLUSION:The radiological manifestations, histological changes, cell survival and mRNA expression levels of aggrecan, collagen type Ⅱ and Sox9 showed no significant difference between the blank control and sham groups. Comparied with the blank control group, in the experimental group, the L4/5 intervertebral space was narrowed with time, the articular surface was coarse, and the upper and lower corpus vertebrae edge appeared to have lip-shaped hyperplasia; the intervertebral disc cells distributed irregularly; the nucleus pulposus was in dehydration and deflation, annulus fibrosus arranged irregularly, and the vacuoles in notochord cells tended to disappear; the expression levels of aggrecan, collagen type Ⅱ and SOX9 were markedly downregulated. These findings suggest that the in vivo rabbit model of intervertebral disc is successfully established, in which continuous mechanical tensile load is further proved to directly cause intervertebral disc degeneration.

Objective To explore the effect of the simvastatin administration on the expression of connective tissue growth factor （CTGF） in fihrotic lungs of rats. Methods The cats were treated with single intratracheal instillation of bleomycin （BLM） or instillation of the same volume of normal saline （NS） as a control. The administration of simvastatin（20 mg/kg）began once a day immediately or 7 days later after intratracheal BLM instillation respectively with the same volume of NS was given as a vehicle control. The rats were killed on day 7,14 and 28 respectively. Pathological alteration of lung tissue was observed hy HE staining and Masson staining. Hydroxyproline（HYP）content in lung tissue was used to determine the severity of pulmonary fibrosis. The expression of CTGF in lung tissue was exanfined by immunohistochem- istry staining and photodeusitometry. Results Histopathological changes of pulmonary fibrosis emerged gradually after the instillation of BLM. The expression level of CTGF was increased in lungs of rats after intratracheal instillation of BLM, compared with the control. The administration of simvastatin immediately or 7 days after intratracheal instillation of BLM, attenuated the histopathological changes of bleomycin- induced puhnonary fibrosis and prevented the increased expression of CTGF in lung tissue on day 28. Conclusion The adntinistration of simvastatin, immediately or 7 days after intratracheal BLM instillation, prevented the up-regulation of CTGF in fibrotic lungs of rats, which ntight be one of the mechanisms of the anti-fihrosis of simvastatin in lungs.

The pivotal characteristics, the current situation, the challenge being faced with and the potential solution related to the automatized flow line of the clinical laboratory is introduced in order to provide the reference for the healthy development of the full automatization of the clinical laboratories in China.

Objective To investigate the relationship among the average checking time of biochemistry results ,mental health of biochemistry results checkers and the rate of medical complains .Methods 258 biochemistry results checkers from 17 hospitals of Guangdong were tested by using symptom checklist(SCL‐90) ,biochemistry results checking time questionnaire and medical com‐plaints questionnaire .Results Compared with the national model data ,the mental health levels of biochemistry results checkers were worse relatively .The mental heath did not have gender difference ,however ,female checkers were significant worse than males in horror .The mental heath didn′t have gender difference between secondary and advanced technicians .However ,the junior techni‐cians were significant worse than technicians of other levels in obsession ,somatization ,anxiety ,depression and horror .The average checking time of biochemistry results was correlated with mental health of biochemistry results checkers .The average checking time of biochemistry results had relationship with the rate of medical complains .Conclusion The mental health conditions of biochemis‐try results checkers are bad .No mental health difference exists in gender .The junior technicians′mental heath are significant worse than secondary and advanced technicians .There are some relationships between the average checking time of biochemistry results , mental health of biochemistry results checkers and the rate of medical complains .

Objective To investigate the expression of p-MNK1 in non-small cell lung cancer and its relationship with clinic pathological features and prognosis.Methods The level of p-MNK1 in 115 cases of nonsmall cell lung cancer was detected by tissue microarray technique and immunohistochemistry technique.Results The level of p-MNK 1 in non-small cell lung cancer was correlated with cancer tissue type (P ＜ 0.05),clinical stage (P ＜ 0.05),lymph node metastasis (P ＜ 0.01) and prognosis (P ＜ 0.05).Cox multiple regression analysis showed that p-MNK1 expression was an independent prognostic factor for non-small cell lung cancer (P ＜ 0.01).Conclusion The level of p-MNK1 in non-small cell lung cancer is associated with poor prognosis.It can be used as an independent prognostic marker and a new therapeutic target.

Objective To evaluate the effects of different interventios on insulin resistance and ?-cell function in population with impaired glucose tolerance(impaired glucose tolerance,IGT).Methods The total of 382 cases of IGT were divided into five groups according to interventions:control(C),diet plus exercise group(D+E),Acarbose Group(A),Metformin(M)and traditional Chinese medicine Group(TCM),with each group making the appropriate intervention programmes.BMI,FPG,2hPG,F-Ins,P-Ins,F-CP and P-CP were determined before intervention and yearly during the follow up,and BMI,HOMA-IR,HOMA-? were calculated.Results By the end of the study,insulin,F-CP,IR Group D+E and FPG,2hPG,insulin,C-peptide,IR in the other groups were significantly lower than before the intervention(P

Objective:To establish a reasonable and effective formative evaluation system based on the characteristics of practical teaching of medical laboratory to evaluate the effect of practical teaching and improve the quality and level of teaching.Methods:A survey and research method was used to screen the elements needed for the formative evaluation system, so as to construct the framework and evaluation indicators of the practice teaching of this specialty. The students from Batch 2016 were scored before and after implementing formative evaluation, and the results were statistically analyzed by paired t test with SPSS 20.0 software. Results:The survey results of a total of 30 teachers (experts) and 121 students in this major were counted. According to the practical characteristics of this major, the evaluation system included two first-level indicators, five second-level indicators, and corresponding third-level and fourth-level indicators. After statistical analysis, students' learning interest, practical ability, self-learning ability, team assistance ability and knowledge development ability were all significantly improved after the implementation of formative evaluation ( P<0.01- P<0.05), and students' enthusiasm for class also increased ( P<0.05). Conclusion:It proves that the constructed formative evaluation system conforms to the characteristics of practical teaching of medical laboratory, which helps to improve the effect of practical teaching and lays a foundation for its application in the practical teaching of this professional course.

Anatomic resection aims to improve the surgical efficacy of hepatocellular carcinoma by systematic resection of portal territory. However, due to its deviation of traditional theory and practice, the oncology effect is questionable. Anatomic resection based on portal territory(PT-AR) is planned by the analysis of real portal vein territory, and performed complete resection of tumor-bearing portal territory by fluorescent guidance, while exposing typical inter-territory hepatic vein, so as to ensure the complete function of future liver remnant. PT-AR is based on the core theory of classical anatomic resection, which will correct the deviation of traditional theory and practice from the technical level, so as to lead a better surgical oncology outcomes for hepatocellular carcinoma.

Objective:To analyze the characteristics of sleep disordered breathing (SDB) in children with allergic rhinitis (AR), and improve the diagnosis and treatment at AR combined with obstructive sleep apnea (OSA).Methods:The clinical data of 120 patients with AR and OSA (AR and OSA group) admitted to the respiratory department at Shenzhen Children′s Hospital from May 2019 to December 2020 were retrospectively analyzed.A total of 120 children diagnosed with OSA and excluded AR during the same period were selected as control group.The SDB day and night symptoms, sleep structure characteristics and sleep breathing events were compared between two groups.Results:The average course of disease in children with AR and OSA was significantly longer than that in control group ( P=0.030). The main manifestations of children in AR and OSA group were mouth breathing (100.0%), snoring (99.2%), nasal obstruction (88.5%), and restless sleep (68.0%). There was no significant difference in sleep structure between two groups ( P>0.05), but the sleep efficiency of AR and OSA group was significantly lower than that of control group ( P=0.028). The respiratory events apnea hypopnea index, obstructive apnea index, obstructive apnea hypopnea index, hypopnea index and oxygen desaturation index of each sleep period in AR and OSA group were significantly higher than those in control group ( P<0.05). Among the children in AR and OSA group, moderate and severe OSA were the main manifestations, and the difference between two groups was statistically significant ( P<0.001). Conclusion:The combination of AR delayed the course of OSA in children.The main characteristics of sleep disordered breathing in children with AR are mouth opening, restless sleep, snoring and nasal obstruction.The sleep efficiency is decreased.Obstructive hypopnea and apnea are the most common respiratory events, and oxygen deficiency often occurs in rapid eye movement phase.Children with AR are more likely to have moderate or severe obstructive sleep apnea.

In the past 30 years, laparoscopic hepatectomy has developed rapidly, which multi-dimensionally promoted the innovation of hepatectomy technology and strategy. This is mainly attributed to the key factors such as the improvement of domestic and foreign scholars′ under-standing of liver anatomy, the conversion and application of laparotomy technology, the expansion of laparoscopic vision and the feedback in surgery related fields. The authors summarize the enlighten-ment, development, promotion and sublimation of laparoscopic hepatectomy, and discuss the classi-fication and evolution of the surgical approach of laparoscopic hepatectomy.